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On several occasions I have noticed that my brake pedal will drop about a 1/2 inch while at a stoplight. I have only noticed it at idle but the movement is somewhat surprising. Anybody else notice it? It feels related to the brake booster action at such a low idle speed
 

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I have not noticed this in mine but have had other cars do this also. I was told it is normal and has to do with pressure by pass valve. I would still take it to the dealer for confirmation. Good luck.
 
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